Cryptic crossword clue
Growing medium, not old, put out by inventor 4

The most common and most likely answer to this crossword clue is the 4 letter word COIR

C
O
I
R

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The straight part
We know that "Growing medium" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case growing medium = coir.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does COIR mean?

COIR noun
  1. The fibre obtained from the husk of a coconut, used chiefly in making rope, matting and as a peat substitute.

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